Bumping gaia.json for 9 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/852125d3fa04
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 959053 - [settings] add marionette test for battery panel"

This reverts commit 75be317a0986bd4cf870fa136306696e2de61a5e.

Reverting due to failing travis linter.

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https://hg.mozilla.org/integration/gaia-central/rev/92a740db0223
Author: Al Tsai <atsai@mozilla.com>
Desc: Merge pull request #15625 from altsai/bug948826-2

resend pr for bug 948826

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https://hg.mozilla.org/integration/gaia-central/rev/b923f6a5dba7
Author: Al Tsai[:atsai] <atsai@mozilla.com>
Desc: resend pr for bug 948826

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https://hg.mozilla.org/integration/gaia-central/rev/ca48150438a1
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #15575 from MBRSL/bug-962379-menu-description

Bug 962379 - [UITest][UI] change the description of contextmenu test, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/f3b3b2db0749
Author: Tom Jao <tjao@mozilla.com>
Desc: Bug 962379 - [UITest][UI] change the description of contextmenu test

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https://hg.mozilla.org/integration/gaia-central/rev/68897b83bae4
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #15245 from gasolin/issue-959053

Bug 959053 - [settings] add marionette test for battery panel, r=authur

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https://hg.mozilla.org/integration/gaia-central/rev/ae6a7554652e
Author: gasolin <gasolin@gmail.com>
Desc: Bug 959053 - [settings] add marionette test for battery panel

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https://hg.mozilla.org/integration/gaia-central/rev/9516b32864c1
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #15626 from cctuan/921828-2

Bug 921828 - (app-menu) [Window Management] Refactor ListMenu and move i...

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https://hg.mozilla.org/integration/gaia-central/rev/9a3ad77b3fec
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 921828 - (app-menu) [Window Management] Refactor ListMenu and move it to AppWindow + implement System Wide Menu if needed
Bumping manifests a=b2g-bump